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yes, oil seal right there on front cover where the final shaft comes through. you do not have to pull the engine to replace this seal ?..but..you do have to pull engine, split it, in order to replace the final shaft.

Yes, that seal is under final shaft in the schematics.

Thank you! These are the kind of tidbits that make a forum like this such a wealth of knowledge. Greatly appreciated!

little tip: the trx400fm and the early trx450S ( '98-'01 trx450S ) , both use the same front differentials.

front final shaft is shot, time to replace. may as well open up the front diff, have a look at the ring gear, and all the bearings. keep in mind, you should replace all 3 oil seals while you are rebuilding it. word of caution !, the final shaft, in order to replace it ?, the engine has to come out, engine split in order to replace the final shaft. replace that oil seal right there in the front cover also.